Blister



FIG. 1 is a top perspective view of a blister;

FIG. 2 is a front view of the blister;

FIG. 3 is a rear view of the blister;

FIG. 4 is a right side view of the blister;

FIG. 5 is a left side view of the blister;

FIG. 6 is a top view of the blister; and,

FIG. 7 is a bottom view of the blister. 

CLAIM The ornamental design for a blister, as shown and described. 